CVE-2026-89586
HighCVSS 8.2Exploitation Probability (EPSS)
Low risk44th percentile - higher than 44% of all known CVEs
Summary
The Linux kernel has a bug in ata_format_dsm_trim_descr(), which builds the ATA TRIM descriptor in a 2048-byte buffer. On devices with a logical sector size larger than 2048 bytes (e.g. 4Kn with 4096-byte sectors), the function can never return the expected sector size, so every TRIM is rejected with a parameter list length error and triggers WARN_ON() splats.
Risk Assessment
TRIM/discard operations are completely broken on devices with logical sector sizes larger than 2048 bytes, potentially degrading performance and increasing SSD wear while flooding kernel logs with warnings.
Recommendation
Update the Linux kernel to a version containing the fix that emits exactly one 512-byte page regardless of logical sector size. Until patched, avoid relying on TRIM/discard on 4Kn devices.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: ata: libata-scsi: fix DSM TRIM for sector sizes larger than 2048 bytes ata_scsi_write_same_xlat() translates a SCSI WRITE SAME command with the UNMAP bit set into an ATA DATA SET MANAGEMENT TRIM command. The TRIM descriptor is built by ata_format_dsm_trim_descr() into the 2048-byte ata_scsi_rbuf staging buffer, and the number of bytes copied is compared against the logical sector size by the caller: size = ata_format_dsm_trim_descr(scmd, trmax, block, n_block); if (size != len) /* len == sdp->sector_size */ goto invalid_param_len; ata_format_dsm_trim_descr() clamps the copy length to ATA_SCSI_RBUF_SIZE (2048). On a device whose logical sector size exceeds that (e.g. a 4Kn device, where sector_size == 4096) the function can never return more than 2048, while the caller expects it to return sector_size. The comparison therefore always fails, so every TRIM is rejected with "Parameter list length error" and WARN_ON() splats on each attempt. TRIM / discard is thus completely broken on such devices. The descriptor was incorrectly sized from the logical sector size. A DSM TRIM payload is a list of 512-byte pages, each holding up to ATA_MAX_TRIM_RNUM (64) LBA Range Entries, and is independent of the logical sector size. The Block Limits VPD page already advertises a single such page as the maximum WRITE SAME length (65535 * ATA_MAX_TRIM_RNUM logical blocks), so the block layer never sends a request that needs more than one page. Emit exactly one 512-byte page, independent of the logical sector size, and transfer only that page (COUNT == 1). For a 512-byte-sector device this is unchanged; devices with larger logical sectors now work instead of failing every TRIM.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS